2 * Linux INET6 implementation
5 * Pedro Roque <roque@di.fc.ul.pt>
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version
10 * 2 of the License, or (at your option) any later version.
16 #include <linux/ipv6.h>
17 #include <linux/hardirq.h>
18 #include <linux/jhash.h>
19 #include <net/if_inet6.h>
20 #include <net/ndisc.h>
24 #define SIN6_LEN_RFC2133 24
26 #define IPV6_MAXPLEN 65535
29 * NextHeader field of IPv6 header
32 #define NEXTHDR_HOP 0 /* Hop-by-hop option header. */
33 #define NEXTHDR_TCP 6 /* TCP segment. */
34 #define NEXTHDR_UDP 17 /* UDP message. */
35 #define NEXTHDR_IPV6 41 /* IPv6 in IPv6 */
36 #define NEXTHDR_ROUTING 43 /* Routing header. */
37 #define NEXTHDR_FRAGMENT 44 /* Fragmentation/reassembly header. */
38 #define NEXTHDR_GRE 47 /* GRE header. */
39 #define NEXTHDR_ESP 50 /* Encapsulating security payload. */
40 #define NEXTHDR_AUTH 51 /* Authentication header. */
41 #define NEXTHDR_ICMP 58 /* ICMP for IPv6. */
42 #define NEXTHDR_NONE 59 /* No next header */
43 #define NEXTHDR_DEST 60 /* Destination options header. */
44 #define NEXTHDR_MOBILITY 135 /* Mobility header. */
46 #define NEXTHDR_MAX 255
50 #define IPV6_DEFAULT_HOPLIMIT 64
51 #define IPV6_DEFAULT_MCASTHOPS 1
56 * type - unicast | multicast
57 * scope - local | site | global
64 #define IPV6_ADDR_ANY 0x0000U
66 #define IPV6_ADDR_UNICAST 0x0001U
67 #define IPV6_ADDR_MULTICAST 0x0002U
69 #define IPV6_ADDR_LOOPBACK 0x0010U
70 #define IPV6_ADDR_LINKLOCAL 0x0020U
71 #define IPV6_ADDR_SITELOCAL 0x0040U
73 #define IPV6_ADDR_COMPATv4 0x0080U
75 #define IPV6_ADDR_SCOPE_MASK 0x00f0U
77 #define IPV6_ADDR_MAPPED 0x1000U
82 #define IPV6_ADDR_MC_SCOPE(a) \
83 ((a)->s6_addr[1] & 0x0f) /* nonstandard */
84 #define __IPV6_ADDR_SCOPE_INVALID -1
85 #define IPV6_ADDR_SCOPE_NODELOCAL 0x01
86 #define IPV6_ADDR_SCOPE_LINKLOCAL 0x02
87 #define IPV6_ADDR_SCOPE_SITELOCAL 0x05
88 #define IPV6_ADDR_SCOPE_ORGLOCAL 0x08
89 #define IPV6_ADDR_SCOPE_GLOBAL 0x0e
94 #define IPV6_ADDR_MC_FLAG_TRANSIENT(a) \
95 ((a)->s6_addr[1] & 0x10)
96 #define IPV6_ADDR_MC_FLAG_PREFIX(a) \
97 ((a)->s6_addr[1] & 0x20)
98 #define IPV6_ADDR_MC_FLAG_RENDEZVOUS(a) \
99 ((a)->s6_addr[1] & 0x40)
102 * fragmentation header
109 __be32 identification;
112 #define IP6_MF 0x0001
114 #define IP6_REPLY_MARK(net, mark) \
115 ((net)->ipv6.sysctl.fwmark_reflect ? (mark) : 0)
117 #include <net/sock.h>
120 extern int sysctl_mld_max_msf;
122 #define _DEVINC(net, statname, modifier, idev, field) \
124 struct inet6_dev *_idev = (idev); \
125 if (likely(_idev != NULL)) \
126 SNMP_INC_STATS##modifier((_idev)->stats.statname, (field)); \
127 SNMP_INC_STATS##modifier((net)->mib.statname##_statistics, (field));\
130 /* per device counters are atomic_long_t */
131 #define _DEVINCATOMIC(net, statname, modifier, idev, field) \
133 struct inet6_dev *_idev = (idev); \
134 if (likely(_idev != NULL)) \
135 SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \
136 SNMP_INC_STATS##modifier((net)->mib.statname##_statistics, (field));\
139 /* per device and per net counters are atomic_long_t */
140 #define _DEVINC_ATOMIC_ATOMIC(net, statname, idev, field) \
142 struct inet6_dev *_idev = (idev); \
143 if (likely(_idev != NULL)) \
144 SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \
145 SNMP_INC_STATS_ATOMIC_LONG((net)->mib.statname##_statistics, (field));\
148 #define _DEVADD(net, statname, modifier, idev, field, val) \
150 struct inet6_dev *_idev = (idev); \
151 if (likely(_idev != NULL)) \
152 SNMP_ADD_STATS##modifier((_idev)->stats.statname, (field), (val)); \
153 SNMP_ADD_STATS##modifier((net)->mib.statname##_statistics, (field), (val));\
156 #define _DEVUPD(net, statname, modifier, idev, field, val) \
158 struct inet6_dev *_idev = (idev); \
159 if (likely(_idev != NULL)) \
160 SNMP_UPD_PO_STATS##modifier((_idev)->stats.statname, field, (val)); \
161 SNMP_UPD_PO_STATS##modifier((net)->mib.statname##_statistics, field, (val));\
166 #define IP6_INC_STATS(net, idev,field) \
167 _DEVINC(net, ipv6, 64, idev, field)
168 #define IP6_INC_STATS_BH(net, idev,field) \
169 _DEVINC(net, ipv6, 64_BH, idev, field)
170 #define IP6_ADD_STATS(net, idev,field,val) \
171 _DEVADD(net, ipv6, 64, idev, field, val)
172 #define IP6_ADD_STATS_BH(net, idev,field,val) \
173 _DEVADD(net, ipv6, 64_BH, idev, field, val)
174 #define IP6_UPD_PO_STATS(net, idev,field,val) \
175 _DEVUPD(net, ipv6, 64, idev, field, val)
176 #define IP6_UPD_PO_STATS_BH(net, idev,field,val) \
177 _DEVUPD(net, ipv6, 64_BH, idev, field, val)
178 #define ICMP6_INC_STATS(net, idev, field) \
179 _DEVINCATOMIC(net, icmpv6, , idev, field)
180 #define ICMP6_INC_STATS_BH(net, idev, field) \
181 _DEVINCATOMIC(net, icmpv6, _BH, idev, field)
183 #define ICMP6MSGOUT_INC_STATS(net, idev, field) \
184 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256)
185 #define ICMP6MSGOUT_INC_STATS_BH(net, idev, field) \
186 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256)
187 #define ICMP6MSGIN_INC_STATS_BH(net, idev, field) \
188 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field)
190 struct ip6_ra_chain {
191 struct ip6_ra_chain *next;
194 void (*destructor)(struct sock *);
197 extern struct ip6_ra_chain *ip6_ra_chain;
198 extern rwlock_t ip6_ra_lock;
201 This structure is prepared by protocol, when parsing
202 ancillary data and passed to IPv6.
205 struct ipv6_txoptions {
206 /* Length of this structure */
209 /* length of extension headers */
211 __u16 opt_flen; /* after fragment hdr */
212 __u16 opt_nflen; /* before fragment hdr */
214 struct ipv6_opt_hdr *hopopt;
215 struct ipv6_opt_hdr *dst0opt;
216 struct ipv6_rt_hdr *srcrt; /* Routing Header */
217 struct ipv6_opt_hdr *dst1opt;
219 /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */
222 struct ip6_flowlabel {
223 struct ip6_flowlabel __rcu *next;
227 struct ipv6_txoptions *opt;
228 unsigned long linger;
235 unsigned long lastuse;
236 unsigned long expires;
240 #define IPV6_FLOWINFO_MASK cpu_to_be32(0x0FFFFFFF)
241 #define IPV6_FLOWLABEL_MASK cpu_to_be32(0x000FFFFF)
243 struct ipv6_fl_socklist {
244 struct ipv6_fl_socklist __rcu *next;
245 struct ip6_flowlabel *fl;
249 extern struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk, __be32 label);
250 extern struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions * opt_space,
251 struct ip6_flowlabel * fl,
252 struct ipv6_txoptions * fopt);
253 extern void fl6_free_socklist(struct sock *sk);
254 extern int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen);
255 extern int ip6_flowlabel_init(void);
256 extern void ip6_flowlabel_cleanup(void);
258 static inline void fl6_sock_release(struct ip6_flowlabel *fl)
261 atomic_dec(&fl->users);
264 extern void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info);
266 int icmpv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6,
267 struct icmp6hdr *thdr, int len);
269 struct dst_entry *icmpv6_route_lookup(struct net *net, struct sk_buff *skb,
270 struct sock *sk, struct flowi6 *fl6);
272 extern int ip6_ra_control(struct sock *sk, int sel);
274 extern int ipv6_parse_hopopts(struct sk_buff *skb);
276 extern struct ipv6_txoptions * ipv6_dup_options(struct sock *sk, struct ipv6_txoptions *opt);
277 extern struct ipv6_txoptions * ipv6_renew_options(struct sock *sk, struct ipv6_txoptions *opt,
279 struct ipv6_opt_hdr __user *newopt,
281 struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space,
282 struct ipv6_txoptions *opt);
284 extern bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb);
286 static inline bool ipv6_accept_ra(struct inet6_dev *idev)
288 /* If forwarding is enabled, RA are not accepted unless the special
289 * hybrid mode (accept_ra=2) is enabled.
291 return idev->cnf.forwarding ? idev->cnf.accept_ra == 2 :
295 #if IS_ENABLED(CONFIG_IPV6)
296 static inline int ip6_frag_nqueues(struct net *net)
298 return net->ipv6.frags.nqueues;
301 static inline int ip6_frag_mem(struct net *net)
303 return sum_frag_mem_limit(&net->ipv6.frags);
307 #define IPV6_FRAG_HIGH_THRESH (4 * 1024*1024) /* 4194304 */
308 #define IPV6_FRAG_LOW_THRESH (3 * 1024*1024) /* 3145728 */
309 #define IPV6_FRAG_TIMEOUT (60 * HZ) /* 60 seconds */
311 extern int __ipv6_addr_type(const struct in6_addr *addr);
312 static inline int ipv6_addr_type(const struct in6_addr *addr)
314 return __ipv6_addr_type(addr) & 0xffff;
317 static inline int ipv6_addr_scope(const struct in6_addr *addr)
319 return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK;
322 static inline int __ipv6_addr_src_scope(int type)
324 return (type == IPV6_ADDR_ANY) ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16);
327 static inline int ipv6_addr_src_scope(const struct in6_addr *addr)
329 return __ipv6_addr_src_scope(__ipv6_addr_type(addr));
332 static inline bool __ipv6_addr_needs_scope_id(int type)
334 return type & IPV6_ADDR_LINKLOCAL ||
335 (type & IPV6_ADDR_MULTICAST &&
336 (type & (IPV6_ADDR_LOOPBACK|IPV6_ADDR_LINKLOCAL)));
339 static inline __u32 ipv6_iface_scope_id(const struct in6_addr *addr, int iface)
341 return __ipv6_addr_needs_scope_id(__ipv6_addr_type(addr)) ? iface : 0;
344 static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2)
346 return memcmp(a1, a2, sizeof(struct in6_addr));
350 ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m,
351 const struct in6_addr *a2)
353 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
354 const unsigned long *ul1 = (const unsigned long *)a1;
355 const unsigned long *ulm = (const unsigned long *)m;
356 const unsigned long *ul2 = (const unsigned long *)a2;
358 return !!(((ul1[0] ^ ul2[0]) & ulm[0]) |
359 ((ul1[1] ^ ul2[1]) & ulm[1]));
361 return !!(((a1->s6_addr32[0] ^ a2->s6_addr32[0]) & m->s6_addr32[0]) |
362 ((a1->s6_addr32[1] ^ a2->s6_addr32[1]) & m->s6_addr32[1]) |
363 ((a1->s6_addr32[2] ^ a2->s6_addr32[2]) & m->s6_addr32[2]) |
364 ((a1->s6_addr32[3] ^ a2->s6_addr32[3]) & m->s6_addr32[3]));
368 static inline void ipv6_addr_prefix(struct in6_addr *pfx,
369 const struct in6_addr *addr,
372 /* caller must guarantee 0 <= plen <= 128 */
376 memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr));
377 memcpy(pfx->s6_addr, addr, o);
379 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b);
382 static inline void __ipv6_addr_set_half(__be32 *addr,
383 __be32 wh, __be32 wl)
385 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
386 #if defined(__BIG_ENDIAN)
387 if (__builtin_constant_p(wh) && __builtin_constant_p(wl)) {
388 *(__force u64 *)addr = ((__force u64)(wh) << 32 | (__force u64)(wl));
391 #elif defined(__LITTLE_ENDIAN)
392 if (__builtin_constant_p(wl) && __builtin_constant_p(wh)) {
393 *(__force u64 *)addr = ((__force u64)(wl) << 32 | (__force u64)(wh));
402 static inline void ipv6_addr_set(struct in6_addr *addr,
403 __be32 w1, __be32 w2,
404 __be32 w3, __be32 w4)
406 __ipv6_addr_set_half(&addr->s6_addr32[0], w1, w2);
407 __ipv6_addr_set_half(&addr->s6_addr32[2], w3, w4);
410 static inline bool ipv6_addr_equal(const struct in6_addr *a1,
411 const struct in6_addr *a2)
413 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
414 const unsigned long *ul1 = (const unsigned long *)a1;
415 const unsigned long *ul2 = (const unsigned long *)a2;
417 return ((ul1[0] ^ ul2[0]) | (ul1[1] ^ ul2[1])) == 0UL;
419 return ((a1->s6_addr32[0] ^ a2->s6_addr32[0]) |
420 (a1->s6_addr32[1] ^ a2->s6_addr32[1]) |
421 (a1->s6_addr32[2] ^ a2->s6_addr32[2]) |
422 (a1->s6_addr32[3] ^ a2->s6_addr32[3])) == 0;
426 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
427 static inline bool __ipv6_prefix_equal64_half(const __be64 *a1,
431 if (len && ((*a1 ^ *a2) & cpu_to_be64((~0UL) << (64 - len))))
436 static inline bool ipv6_prefix_equal(const struct in6_addr *addr1,
437 const struct in6_addr *addr2,
438 unsigned int prefixlen)
440 const __be64 *a1 = (const __be64 *)addr1;
441 const __be64 *a2 = (const __be64 *)addr2;
443 if (prefixlen >= 64) {
446 return __ipv6_prefix_equal64_half(a1 + 1, a2 + 1, prefixlen - 64);
448 return __ipv6_prefix_equal64_half(a1, a2, prefixlen);
451 static inline bool ipv6_prefix_equal(const struct in6_addr *addr1,
452 const struct in6_addr *addr2,
453 unsigned int prefixlen)
455 const __be32 *a1 = addr1->s6_addr32;
456 const __be32 *a2 = addr2->s6_addr32;
457 unsigned int pdw, pbi;
459 /* check complete u32 in prefix */
460 pdw = prefixlen >> 5;
461 if (pdw && memcmp(a1, a2, pdw << 2))
464 /* check incomplete u32 in prefix */
465 pbi = prefixlen & 0x1f;
466 if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi))))
473 struct inet_frag_queue;
475 enum ip6_defrag_users {
476 IP6_DEFRAG_LOCAL_DELIVER,
477 IP6_DEFRAG_CONNTRACK_IN,
478 __IP6_DEFRAG_CONNTRACK_IN = IP6_DEFRAG_CONNTRACK_IN + USHRT_MAX,
479 IP6_DEFRAG_CONNTRACK_OUT,
480 __IP6_DEFRAG_CONNTRACK_OUT = IP6_DEFRAG_CONNTRACK_OUT + USHRT_MAX,
481 IP6_DEFRAG_CONNTRACK_BRIDGE_IN,
482 __IP6_DEFRAG_CONNTRACK_BRIDGE_IN = IP6_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX,
485 struct ip6_create_arg {
488 const struct in6_addr *src;
489 const struct in6_addr *dst;
493 void ip6_frag_init(struct inet_frag_queue *q, void *a);
494 bool ip6_frag_match(struct inet_frag_queue *q, void *a);
497 * Equivalent of ipv4 struct ip
500 struct inet_frag_queue q;
502 __be32 id; /* fragment id */
504 struct in6_addr saddr;
505 struct in6_addr daddr;
513 void ip6_expire_frag_queue(struct net *net, struct frag_queue *fq,
514 struct inet_frags *frags);
516 static inline bool ipv6_addr_any(const struct in6_addr *a)
518 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
519 const unsigned long *ul = (const unsigned long *)a;
521 return (ul[0] | ul[1]) == 0UL;
523 return (a->s6_addr32[0] | a->s6_addr32[1] |
524 a->s6_addr32[2] | a->s6_addr32[3]) == 0;
528 static inline u32 ipv6_addr_hash(const struct in6_addr *a)
530 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
531 const unsigned long *ul = (const unsigned long *)a;
532 unsigned long x = ul[0] ^ ul[1];
534 return (u32)(x ^ (x >> 32));
536 return (__force u32)(a->s6_addr32[0] ^ a->s6_addr32[1] ^
537 a->s6_addr32[2] ^ a->s6_addr32[3]);
541 /* more secured version of ipv6_addr_hash() */
542 static inline u32 __ipv6_addr_jhash(const struct in6_addr *a, const u32 initval)
544 u32 v = (__force u32)a->s6_addr32[0] ^ (__force u32)a->s6_addr32[1];
546 return jhash_3words(v,
547 (__force u32)a->s6_addr32[2],
548 (__force u32)a->s6_addr32[3],
552 static inline u32 ipv6_addr_jhash(const struct in6_addr *a)
554 return __ipv6_addr_jhash(a, ipv6_hash_secret);
557 static inline bool ipv6_addr_loopback(const struct in6_addr *a)
559 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
560 const unsigned long *ul = (const unsigned long *)a;
562 return (ul[0] | (ul[1] ^ cpu_to_be64(1))) == 0UL;
564 return (a->s6_addr32[0] | a->s6_addr32[1] |
565 a->s6_addr32[2] | (a->s6_addr32[3] ^ htonl(1))) == 0;
569 static inline bool ipv6_addr_v4mapped(const struct in6_addr *a)
572 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
575 (a->s6_addr32[0] | a->s6_addr32[1]) |
577 (a->s6_addr32[2] ^ htonl(0x0000ffff))) == 0UL;
581 * Check for a RFC 4843 ORCHID address
582 * (Overlay Routable Cryptographic Hash Identifiers)
584 static inline bool ipv6_addr_orchid(const struct in6_addr *a)
586 return (a->s6_addr32[0] & htonl(0xfffffff0)) == htonl(0x20010010);
589 static inline void ipv6_addr_set_v4mapped(const __be32 addr,
590 struct in6_addr *v4mapped)
592 ipv6_addr_set(v4mapped,
599 * find the first different bit between two addresses
600 * length of address must be a multiple of 32bits
602 static inline int __ipv6_addr_diff32(const void *token1, const void *token2, int addrlen)
604 const __be32 *a1 = token1, *a2 = token2;
609 for (i = 0; i < addrlen; i++) {
610 __be32 xb = a1[i] ^ a2[i];
612 return i * 32 + 31 - __fls(ntohl(xb));
616 * we should *never* get to this point since that
617 * would mean the addrs are equal
619 * However, we do get to it 8) And exacly, when
620 * addresses are equal 8)
622 * ip route add 1111::/128 via ...
623 * ip route add 1111::/64 via ...
626 * Ideally, this function should stop comparison
627 * at prefix length. It does not, but it is still OK,
628 * if returned value is greater than prefix length.
634 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
635 static inline int __ipv6_addr_diff64(const void *token1, const void *token2, int addrlen)
637 const __be64 *a1 = token1, *a2 = token2;
642 for (i = 0; i < addrlen; i++) {
643 __be64 xb = a1[i] ^ a2[i];
645 return i * 64 + 63 - __fls(be64_to_cpu(xb));
652 static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen)
654 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
655 if (__builtin_constant_p(addrlen) && !(addrlen & 7))
656 return __ipv6_addr_diff64(token1, token2, addrlen);
658 return __ipv6_addr_diff32(token1, token2, addrlen);
661 static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2)
663 return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr));
667 * Header manipulation
669 static inline void ip6_flow_hdr(struct ipv6hdr *hdr, unsigned int tclass,
672 *(__be32 *)hdr = htonl(0x60000000 | (tclass << 20)) | flowlabel;
675 static inline __be32 ip6_flowinfo(const struct ipv6hdr *hdr)
677 return *(__be32 *)hdr & IPV6_FLOWINFO_MASK;
681 * Prototypes exported by ipv6
685 * rcv function (called from netdevice level)
688 extern int ipv6_rcv(struct sk_buff *skb,
689 struct net_device *dev,
690 struct packet_type *pt,
691 struct net_device *orig_dev);
693 extern int ip6_rcv_finish(struct sk_buff *skb);
696 * upper-layer output functions
698 extern int ip6_xmit(struct sock *sk,
701 struct ipv6_txoptions *opt,
704 extern int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr);
706 extern int ip6_append_data(struct sock *sk,
707 int getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb),
713 struct ipv6_txoptions *opt,
719 extern int ip6_push_pending_frames(struct sock *sk);
721 extern void ip6_flush_pending_frames(struct sock *sk);
723 extern int ip6_dst_lookup(struct sock *sk,
724 struct dst_entry **dst,
726 extern struct dst_entry * ip6_dst_lookup_flow(struct sock *sk,
728 const struct in6_addr *final_dst,
730 extern struct dst_entry * ip6_sk_dst_lookup_flow(struct sock *sk,
732 const struct in6_addr *final_dst,
734 extern struct dst_entry * ip6_blackhole_route(struct net *net,
735 struct dst_entry *orig_dst);
738 * skb processing functions
741 extern int ip6_output(struct sk_buff *skb);
742 extern int ip6_forward(struct sk_buff *skb);
743 extern int ip6_input(struct sk_buff *skb);
744 extern int ip6_mc_input(struct sk_buff *skb);
746 extern int __ip6_local_out(struct sk_buff *skb);
747 extern int ip6_local_out(struct sk_buff *skb);
750 * Extension header (options) processing
753 extern void ipv6_push_nfrag_opts(struct sk_buff *skb,
754 struct ipv6_txoptions *opt,
756 struct in6_addr **daddr_p);
757 extern void ipv6_push_frag_opts(struct sk_buff *skb,
758 struct ipv6_txoptions *opt,
761 extern int ipv6_skip_exthdr(const struct sk_buff *, int start,
762 u8 *nexthdrp, __be16 *frag_offp);
764 extern bool ipv6_ext_hdr(u8 nexthdr);
767 IP6_FH_F_FRAG = (1 << 0),
768 IP6_FH_F_AUTH = (1 << 1),
769 IP6_FH_F_SKIP_RH = (1 << 2),
772 /* find specified header and get offset to it */
773 extern int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset,
774 int target, unsigned short *fragoff, int *fragflg);
776 extern int ipv6_find_tlv(struct sk_buff *skb, int offset, int type);
778 extern struct in6_addr *fl6_update_dst(struct flowi6 *fl6,
779 const struct ipv6_txoptions *opt,
780 struct in6_addr *orig);
783 * socket options (ipv6_sockglue.c)
786 extern int ipv6_setsockopt(struct sock *sk, int level,
789 unsigned int optlen);
790 extern int ipv6_getsockopt(struct sock *sk, int level,
794 extern int compat_ipv6_setsockopt(struct sock *sk,
798 unsigned int optlen);
799 extern int compat_ipv6_getsockopt(struct sock *sk,
805 extern int ip6_datagram_connect(struct sock *sk,
806 struct sockaddr *addr, int addr_len);
808 extern int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len);
809 extern int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len,
811 extern void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
812 u32 info, u8 *payload);
813 extern void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info);
814 extern void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu);
816 extern int inet6_release(struct socket *sock);
817 extern int inet6_bind(struct socket *sock, struct sockaddr *uaddr,
819 extern int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
820 int *uaddr_len, int peer);
821 extern int inet6_ioctl(struct socket *sock, unsigned int cmd,
824 extern int inet6_hash_connect(struct inet_timewait_death_row *death_row,
830 extern const struct proto_ops inet6_stream_ops;
831 extern const struct proto_ops inet6_dgram_ops;
833 struct group_source_req;
836 extern int ip6_mc_source(int add, int omode, struct sock *sk,
837 struct group_source_req *pgsr);
838 extern int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf);
839 extern int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
840 struct group_filter __user *optval,
842 extern unsigned int inet6_hash_frag(__be32 id, const struct in6_addr *saddr,
843 const struct in6_addr *daddr, u32 rnd);
845 #ifdef CONFIG_PROC_FS
846 extern int ac6_proc_init(struct net *net);
847 extern void ac6_proc_exit(struct net *net);
848 extern int raw6_proc_init(void);
849 extern void raw6_proc_exit(void);
850 extern int tcp6_proc_init(struct net *net);
851 extern void tcp6_proc_exit(struct net *net);
852 extern int udp6_proc_init(struct net *net);
853 extern void udp6_proc_exit(struct net *net);
854 extern int udplite6_proc_init(void);
855 extern void udplite6_proc_exit(void);
856 extern int ipv6_misc_proc_init(void);
857 extern void ipv6_misc_proc_exit(void);
858 extern int snmp6_register_dev(struct inet6_dev *idev);
859 extern int snmp6_unregister_dev(struct inet6_dev *idev);
862 static inline int ac6_proc_init(struct net *net) { return 0; }
863 static inline void ac6_proc_exit(struct net *net) { }
864 static inline int snmp6_register_dev(struct inet6_dev *idev) { return 0; }
865 static inline int snmp6_unregister_dev(struct inet6_dev *idev) { return 0; }
869 extern ctl_table ipv6_route_table_template[];
870 extern ctl_table ipv6_icmp_table_template[];
872 extern struct ctl_table *ipv6_icmp_sysctl_init(struct net *net);
873 extern struct ctl_table *ipv6_route_sysctl_init(struct net *net);
874 extern int ipv6_sysctl_register(void);
875 extern void ipv6_sysctl_unregister(void);
878 #endif /* _NET_IPV6_H */